Non-homogeneous Reservoir Characterization

ㅇ Using the statistical inversion methods, several seismic attributes of the reservoir were calculated in order to analyze the sediment distribution and reservoir character of the El Feel reservoir in the block NC174 in Libya. The seismic attributes were computed in this study are acoustic impedance, variance, cosine of phase, chaos signal, dominant frequency, envelop amplitude, facies.

ㅇ For the seismic attributes analyzed in this study, the acoustic impedance and envelop amplitude for the south-east area of the reservoir could hardly indicate the reservoir structure and reflected layers. In the opposite, when using the distribution of the cosine of phase and dominant frequency, the size and shape of the reservoir could be estimated and reflected layer of the top reservoir can be visible.

ㅇ Using the time to depth conversion equation, all seismic data including interpreted data were converted from time spatial domain to depth spatial domain. When generating the velocity model using check shot data, the velocity errors get increasing in the area without check data.

ㅇ The result of the time to depth conversion could be affected by the quality of the velocity model

ㅇ Facies attributes and petrophysical properties of the reservoir zone(top of mamuniyat ~ top of basement) of El Feel oil field was analyzed by using deterministic methods and stochastic methods

ㅇ With facies information and without facies information, The two cases of reservoir modeling was conducted to analyze the sensitivity of the STOIIP. The results for the case with facies information showed less difference results than those of the case without facies information. and also in case without facies information, average value of the total modeling results can suggest more resonable statistical inversion results.